CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Statement [Abstract]
Net sales	$ 28,404	$ 26,505	$ 82,586	$ 83,314
Cost of goods sold	19,005	18,387	56,496	57,471
Gross profit	9,399	8,118	26,090	25,843
Selling, general and administrative expense	4,926	4,684	14,547	14,402
Operating income	4,473	3,434	11,543	11,441
Interest income	88	16	161	32
Income before taxes	4,561	3,450	11,704	11,473
Provision for income taxes	1,592	1,209	4,097	4,008
Net income	$ 2,969	$ 2,241	$ 7,607	$ 7,465
Basic and diluted net income per common share	$ 0.24	$ 0.18	$ 0.61	$ 0.60
Cash dividends per share	$ 0.05	$ 0.05	$ 0.15	$ 0.15
Basic and diluted weighted average shares outstanding	12,419	12,411	12,415	12,407